Driving means especially adapted for liquid-measuring pumps.



I A. 1. POCOCK. DRIVING MEANS ESPECIALLY ADAPTED FOR LIQUID MEASURINGPUMPS.

-APPLICATION FILED AUG.4, 1915.

1,178,456. Patented Apr. 4,1916.

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A. J'.'POCOCK A DRIVING MEANS ESPECIALLY ADAPTED FOR LIQUID MEASURINGPUMPS.

APPLICATION FILED AUG.4,19\5. 1,178,456. I Patented Apr. 4,1916.

3 SHEETS-SHEET 2- A; J. POCOCK. DRIVING MEANS ESPECIALLY ADAPTED FORLIQUlD MEASURING PUMPS.

APPLICATION FILED AUG-4, [915. 1,178,456.

Patented Apr. 4,1916.

3 SHEETS-SHEET 3- AUGUSTINE J. POCOUK, QEDAYTON, OHIO.

DRIVING MEANS ESPECIALLY ADAPTED FOR LIQUID-MEASURING PUMPS.

Specification of Letters Patent.

Patented Apr. 4%. 1916.

Application filed August 4, 1915. Serial No. 43,590.-

T 0 all whom it may concern Be it known that I, AUoUsrIivn J. Fococx, acitizen of the United States, residing at Dayton, in the county ofMontgomery and State of Ohio, have invented certain appertains to makeand use the same, reference being had to the accompanying drawings, andto the letters and figures of ref erence marked thereon, which form apart of this specification.

This invention relates to certain improve- 'ments in driving meansespecially adapted for liquid measuring pumps of a singleacting singlecylinder type.

The object and purpose of the invention is to provide a simplified andpositive system ofv reversing and change-speed gears whereby theidlestroke of the piston is accelerated and time is gained in theoperation of the pump as well as accuracy.

A further object of the invention is to provide means for insuring apositive and accurate intermeshing of the gears at all times whenchanging from one drive to the other, as will hereinafter more fullyappear from the following specification in connection with theaccompanying drawings, of which Figures 1 and 2 are vertical elevationsof a liquid measuring pump having my improvements applied thereto. Fig.3 is an enlarged sectional elevation through the gear box showing thearrangement ofthc driving gears and associated parts. Fig. 4: is asectional elevation through the gear box at right angles to Fig. 8. Fig.5 is adetail sectional view ofone of the change speed gears. j Fig. 6 isa detail view-of the cam that occupies a position adjacent to the gearshown in Fig. 5. Fig. 7 is a section on the line c'c of Fig. 3, andFigs. 8 and 9 are elevations of modifications of the gear shiftingdevice.

In a detail description of the invention, similar reference charactersindicate corre sponding parts.

The pump comprises a single cylinder 1 having a chambered head 2'intowhich the liquid is discharged by the piston 7 on the upstroke thereofand from which chambered head the said liquid is discharged into adischarging pipe 3 and thence from-the pump in a well known manner.Extending from the said chambered head is a pipe '3 which supports achambered head 3-at the top thereof. The gearing is inclosed in a boxsuitably mounted on said pipes. As stated, within thisgear box is housedthe driving gears through which. the piston is reciprocated from themovement of a cranbhandle 8 fixed to a lower-shaft 10. Suitablyconnected with the piston rod 6 is a toothed bar or rack 5 which extendsup into the housing at and through an opening 4: in the top of saidhousingwhen the piston is elevated within the cylinder. driving gearwheels 11 and 12 are mounted in the upper portion of the gear box onshaft 9 which has suitable hearings in the sides thereof. The pinion orgear wheel 11 is in constant mesh with the rack 5 and from this gearwheel the piston is directly driven, the movement being reversed, aspresently described. Adjacent to the gear wheel 11 on the same shaft isthe wheel '12,bcfore referred to. -The gear wheels 11 and 12 aresuitably fixed to each other and to the shaft The rack is driven in onedirection by the gear wheel 12 through its connection with gear wheel 11and in the other direction by gear wheel 11 direct. lVith the main drivegear wheel 11 a secondary driving gear wheel 13 is adapted to mesh andthrough which downward movement is imparted to the rack 5 from said gearwheel 11. A. pinion 1d constitutes a.

'secondar drivin ear ada )tcd to mesh with gear wheel 12 and throughwhich the lip-movement is imparted to the rack 5. The pinion 14 is fixedto a sleeve 15 and the gear wheel 13 is journaled on said sleeve whichsleeve in turn is journaled on a counter shaft 10 having proper bearingsinthe lower portion of the gear box. The pinion Primary 14- and thesleeve 15 have a'fixed relation with two double-faced cams 16 and 17which are also fixed to the sleeve 15. The parts 15,

14, 16 and 17 may be designated as the fixed parts. The camslG and 17have opposing inclined working surfaces 18 which are incooperative-relation with dogs 19 fixed to shaft 10 and arranged to rideagainst the. inclined surfaces 18 andv thus impart a slid parts. Thedogs 19 are pinned or otherwise rigidly secured to the counter shaft 10and the latter sh aft is rotated through the crank handle 8, as beforeindicated. As stated the slidable movement is imparted to the fixedparts constituting the pinion 1 4, sleeve 15, and cams 16 and 17, Thisslidable 1novemcnt is also imparted to the gear wheel 13 ends of thedogs 19 engage at the end of the slidable movement of the fixed parts onshaft 10 and thereby the gears on the coun-;

ter shaft 10 are rotated alternately to drive the rack through therespective gear wheels 11 and 1".

Referring particularly to the cam 17 on the right, as shown in Fig. 3,when the dog 19 assembled therewith is rotated by moving theerank-hamlle 8 it slides up the.in-

clined surfaces of said cam and thereby the entire fixed parts inchulinethe cams. pinioii 14-, sleeve 1:"). and the loose gear wheel 13, areslid until the teeth of the pinion 14 come in contact with the teeth ofthe gear 12. In the event that the teeth of the pinion H should jam or"tail to mesh with the teeth of the gear wheel 12 and thereby" create aresistance to the travel of the dog 19 u the incline of the cam 17, theslidable movement of the fixed parts will be arrested or the partsbecome locked against such move mentwith the result that said fixedparts will be caused to rotate and willv slide over the side or ends ofthe teeth of the gear wheel 12 until the teeth of said pinion l t arriveat the point where they can mesh with those of the gear wheel 1 F orexample, at such time the pinion ll continues to slide in its contactwith the gear wheel 12 until it is in a proper position and the dog; 19has traversed the inclines of the cam and has come in contact with theabutments 20 thereof. This causes the fixed parts on the counter shaft10 to revolve, thereby imparting; to the piston. of the pump an upwardnioreu'ient from the pinion it which meshes with the gear wheel 19 Thesliding n'iovement of the teeth of the pinion 1% over the ends of theteeth of the gear Wheel 12 produces some lost motion of the fixed partson the counter shaft 10 and the loose gear wheel 18, and this is liableto occur only in the event the pinion 14 and gear 12 shorld tail toreadily mesh when the pinion "st motion referred to tens place whenWheel 11. is at rest, for example, at the limit of a stroke of thepiston, and the secondary drive gear wheel 13 is in mesh with said wheel11 by reason oi the said gear wheel 13 being journaled on the fixedparts and the rotation. of said fixed parts independently of said. gearwheel 13. lhis lost motion allows the teeth of the pinion 14- to revolveinto position for meshing with the gear wheel 12-, the only resistancet6 said movement of the pinion 14; being a spring 21. Th is spring 21 isconnected at one end to the gear wheel 13 by means of a stud 22 and atthe other end the said spring is connected to the cam 16 which, asbefore stated, is one of the fixed parts. The stud 22 is in a positionto engage a shoulder 23 on the rain 16 and the said stud so constitutesa fixed driving connection. between said cam 16 and the gear wheel 13,acting only as such when engaged by the shoulder under the action of thespring n1. During this movement of the gear wheel 13., the pistonthrough the rack 5, is driven downwardl vr. If in the reverse slidablemovement of the pinion 1% the teeth thereof enthe (lids of the teeth ofthe gear wheel 12 instead o'l meshing therewith, the fixed parts.toavit, the pinion ll, sleeve 15 and cams l6 and ii, will revolve. whilethe gear 12 remains stationary therebywontracting the spri'ivsr E21 andtaking up the lost motion by causing the shoulder 23 on the cam 16 totravel away from the pin This lost motion. it will be understood, allowsthe teeth. of the pinion ll to travel into meshing position with theteeth of the gear Wheel 12 without turning the gear Wheel 13. As thegear wheel 13 slides out of mesh With the main driving gear wheel 11,the said spring re: cts and thereby brings the shoulder 93 in contactwith the pin 22; which is the initial position of the reversedrivingposition. By this arrangement the gears are enabled to be reversed andto properly intermcsh without interruption or obstruction in theoperation of the pump. ltwill be apparent that one douhlesacting caremay be employed to reciprocate the fixed parts on the shaft 10 insteadof two cams as shown with the same result and that in lieu. of one ofsaid cams, for example, that as sociated with the spring 21, anysuitable member may be employed to cooperate with the stud 22 to furnishthe means for rotating the gear wheel 13 through the stud.

-These are obvious expedients which are so simple as not to require anyfurther description or any illustration thereof.

Having described my invention, 1 claim. 1. la a driving mechanism forliquid measuring pumps, the combination with a raclc connected. with thepiston of such pump, of primary driving gear wheels one of which is inconstant mesh with. said. rack and the other of which is connected withthe primary driving gear wheel so in constant mesh with said rack,secondary driving gear wheels adapted to alternately intermesh with saidprimary gear wheels to impart reverse motion to said rack, a sleeveslidably mounted and to which one ofsaid secondary driving gear wheelsis fixed and upon which the other of said secondary driving gear wheelsis journaled, means for reciprocating said sleeve and therewith the gearwheels so mounted thereon to efiect an alternate engaging anddisengaging of said secondary'gear wheels with their respective primarygear wheels, means providing for lost rotary motion of said sleeve andthe gear wheel fixed thereto in the event said fixed gear'wheel shouldfail to mesh with its companion gear wheel, substantially as specified.

2. In a driving gear for liquid measuring pumps, the combination with arack connected with the piston-0f said pump, of primary driving gearsone of which is in constant mesh with said rack and the other of whichis connected with said constantly meshed gear, secondary drivingwgearsadapt-. ed to alternately drive said primary gears,

' a shiftable sleeve to which one of said sec-- ondary gears is fixedand upon which the other of said secondary gears is journaled, camsfixed to said sleeve, said sleeve and cams and the gear fixed theretobeing adapted to receive lost rotary movement in the event that the saidfixed gear fails to readily intermesh with its companion gear whenshifted, shifting members fixed to the shaft upon which said sleeve isjournaled and en gaging said cams to shift said sleeve and the secondarygears-to mesh and unmcsh with their companion primary gears and to all"ternately rotate said gears, a spring attached to the gear journaled onsaid sleeve and to one of said cams, a stud rotated by said shaft andforming a driving connection for the gear wheel journaled on saidsleeve, the spring being adapted to eiiect a connection between saidgear and said stud when the gear fixed to said sleeve is caused tointermesh with its companion gear at the end of said lost motion,substantially as specified.

3. In a gearing of the type speci 'ed, the combination with a rack, ofthe primary driving gears 11 and 12 fixed one to the other and one ofwhich is in permanent mesh with said rack and imparts to said rack areciprocatory movement, secondary driving gears 13 and 14 adapted tomesh and unmeshwith the gears 11 and 12, a shiftable sleeve 15 to whichthe gear 1 1 is fixed and upon which the gear 13 is journaled, earns 16and 17 fixed to said sleeve 15, actuating members 19 fixed to the shaftupon which said sleeve is journaled and engaging said cams to impartslidable movement to the gears 13 and 14 to alternately mesh gear liwithgear 12 and gear 13 with gear 11, said'gear 145 being adapted to receive some lost rotary movement in the event it does not readilyintermesh with the gear 12 when shifted thereto, a spring 21. connectedto the gear 13 and adapted to be contracted during the period of saidlost motion, and a stud 22 forming a driving connection between the gear18 and the shaft upon which said sleeve is journaled, said spring beingadapted to restore the operative connection between the gear 13 and itsdriving stud 22 at the end of the period of said lost motion,substantially as. specified.

In testimony whereof I afiix my signature.

